<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // var arrayLike = {
        //     '0': '张三',
        //     '1': '李四',
        //     '2': '王五',
        //     'length': 3
        // }

        // var ary = Array.from(arrayLike)
        // console.log(ary);

        var arrayLike = {
            '0': '1',
            '1': '2',
            'length': 2
        }
        var ary = Array.from(arrayLike, item => item * 2);
        console.log(ary);
    </script>
</body>

</html>